This forces the ESP8266 to be connected to the internet.
For this to work, it can not be used as an access point. All contents of the page must be included in a container.
For example, we will add the classes btn, btn-success (green color), btn-lg (large). By downloading boostrap builder online, you will find many sites that allow you to make models and get the HTML code. For each item, the different styles available are accessible from menus and checkboxes Once your artwork is complete, to retrieve the HTML code, click Download (on the top bar) and then Continue non logged.